[ITK] GPU filters

[Wei Liu]

Hi communities,

I have a few maybe vague questions about the GPU filters.

- Does GPU base class support vector image (each pixel is a vector)? If I
want to write my own custom GPU filter (or at least my code using GPU base
class), is there anything I should keep in mind, or pitfall I should avoid
when writing OpenCL kernel?

- is multi-GPU supported? From the code, and searching online, it seems it
is not supported yet. If that's the case, what is the difficulty of adding
it myself? (may not in filter format, as long as it works)

- What is the relationship between streaming filter, multi-threading and
OpenCL kernels? I've read chapters in the guide book but appreciate some
insight from the community.

Thank you all!

Wei
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